A method for surface modification of carbon cloth for flexible supercapacitor electrodes

A supercapacitor and surface modification technology, which is applied in the manufacture of hybrid capacitor electrodes and hybrid/electric double layer capacitors. , low cost, easy to promote the effect of industrialization

Active Publication Date: 2019-11-08
NANCHANG HANGKONG UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the calcination temperature of this technology is relatively high, which needs to reach 600-1100°C, and the specific capacitance of the carbon cloth prepared by it is relatively low, which cannot meet the needs of supercapacitor electrodes.

Method used

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  • A method for surface modification of carbon cloth for flexible supercapacitor electrodes
  • A method for surface modification of carbon cloth for flexible supercapacitor electrodes
  • A method for surface modification of carbon cloth for flexible supercapacitor electrodes

Examples

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Effect test

Embodiment 1

[0037] The invention provides a carbon cloth surface modification method for flexible supercapacitor electrodes, comprising the following steps:

[0038] S1: Dissolve 3g of potassium permanganate in the mixed acid of 20ml of concentrated sulfuric acid and 10ml of concentrated nitric acid to form a uniform mixed solution, place carbon in the mixed solution, keep the temperature at 5°C for 3 hours, add 100ml of deionized water, Keep the temperature at 25°C for 5 hours, add 5ml of hydrogen peroxide to prepare carbon oxide cloth; then wash the carbon oxide cloth with deionized water first and then with ethanol, and repeat the above washing steps for 3 times until the washing liquid is neutral. Finally, dry the carbon dioxide at 60°C for 15 hours;

[0039] S2: Weigh 1g of dried carbon oxide cloth and 5g of sodium amide and place them in an iron crucible. Under the protection of nitrogen atmosphere, heat to 320°C at a heating rate of 3°C / min, keep it warm for 5h, and use it after na...

Embodiment 2

[0057] The invention provides a carbon cloth surface modification method for flexible supercapacitor electrodes, comprising the following steps:

[0058] S1: Dissolve 3g of potassium permanganate in the mixed acid of 20ml of concentrated sulfuric acid and 10ml of concentrated nitric acid to form a uniform mixed solution, place carbon in the mixed solution, keep the temperature at 0°C for 3 hours, add 100ml of deionized water, Keep the temperature at 25°C for 5 hours, add 5ml of hydrogen peroxide to prepare carbon oxide cloth; then wash the carbon oxide cloth with deionized water first and then with ethanol, and repeat the above washing steps for 3 times until the washing liquid is neutral. Finally, dry the carbon dioxide at 60°C for 15 hours;

[0059] S2: Weigh 1g of dried carbon oxide cloth and 5g of sodium amide and place them in an iron crucible. Under the protection of nitrogen atmosphere, heat to 300°C at a heating rate of 2°C / min, keep it warm for 6h, and use it after na...

Embodiment 3

[0062] The invention provides a carbon cloth surface modification method for flexible supercapacitor electrodes, comprising the following steps:

[0063] S1: Dissolve 3g of potassium permanganate in the mixed acid of 20ml of concentrated sulfuric acid and 10ml of concentrated nitric acid to form a uniform mixed solution, place carbon in the mixed solution, keep the temperature at 10°C for 2 hours, add 100ml of deionized water, Keep the temperature at 30°C for 3 hours, add 5ml of hydrogen peroxide to prepare carbon oxide cloth; then wash the carbon oxide cloth with deionized water first and then with ethanol, and repeat the above washing steps for 3 times until the washing liquid is neutral. Finally, dry the carbon dioxide at 70°C for 10 hours;

[0064] S2: Weigh 1g of dried carbon oxide cloth and 5g of sodium amide and place them in an iron crucible. Under the protection of nitrogen atmosphere, heat to 350°C at a heating rate of 4°C / min, keep it for 4h, and use it after natura...

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Abstract

The invention provides a method for modifying the surface of carbon cloth used for electrodes of flexible supercapacitors, which includes the following steps: S1: first place carbon in a mixed solution of potassium permanganate and concentrated acid for the first step of reaction, and then add Carry out the second step of reaction with deionized water, and finally add hydrogen peroxide to prepare oxidized carbon cloth, then repeatedly wash the oxidized carbon cloth with deionized water and ethanol until the washing liquid is neutral, and dry it; S2: finally The oxidized carbon cloth after S1 drying treatment was calcined and reduced with sodium amide under a nitrogen atmosphere, and then repeatedly washed with deionized water and ethanol until the washing liquid was neutral, and then dried to obtain a surface-modified carbon cloth. The modified carbon cloth prepared by the method provided by the invention has a uniform surface and a high specific capacitance value. When the current density is from 1mA / cm 2 Increase to 20mA / cm 2 , the capacitance retention rate is above 85%, and has excellent rate performance. Moreover, the method provided by the invention has simple process, low cost and is easy to be popularized in industry.

Description

technical field [0001] The invention relates to the field of electrode material preparation, in particular to a method for modifying the surface of carbon cloth used for flexible supercapacitor electrodes. Background technique [0002] Carbon cloth is the abbreviation of "carbon fiber cloth", which is a textile composed of interlaced carbon fibers. Carbon cloth is a new type of fiber material with a carbon content of more than 95%. It not only has the inherent characteristics of carbon materials, but also has the flexibility and processability of textile fibers. It has high specific strength and good creep resistance. Low density, good thermal and chemical stability, low thermal expansion coefficient and high electrical conductivity, etc., are often used to prepare current collectors and substrates for head electrodes. However, due to the smooth surface of carbon cloth, small specific surface area, and chemical inertness, its specific capacitance (1-2F / g, about 10mF / cm 2 )...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01G11/40H01G11/86
CPCH01G11/40H01G11/86Y02E60/13
Inventor 陈德志周帅权红英
Owner NANCHANG HANGKONG UNIVERSITY
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